>But the way I see it there is only one dimension: oppression and tyranny on one end and free speech and individualism on the other.
Other people don't see it that way, though, and in fact there are a few well-mounted defences from philosophers which define that "other" view. You're arguing for a roughly liberal (perhaps liberal egalitarian) point of view, but we shouldn't act as though this is the only way to conceive a healthy view of liberty and freedom. Liberalism isn't the only game in town any more, and it hasn't been the only game in town (speaking in terms of relief from the oppression of kings and barons) since the 19th century. It is a valid view that is commonly held and argued for, sure, but it is by no means the only coherent view of liberty there is.
>don't recognize the rights to buy and use drugs or consume pornography
Perhaps it's surprising, but there are actually liberal views against pornography, i.e they claim to proceed from core liberal tenets to positions in which pornography would not be permissible - see Rae Langton's work for example. In fact, this caused so much of a storm that liberal philosophers took it upon themselves to try and argue against it precisely because they viewed it as a threat to some traditional liberal opinions. It may further surprise you that some philosophers have argued that J.S. Mill himself(!) would have been against pornography.
>Social and economic freedoms go hand and hand, which is something both conservatives and liberals both seem to be confused about.
This is actually the core of certain 19th c. German critiques of liberalism.
>The only true human right is to live one's own life free from tyranny and oppression.
This is simply one opinion amongst many. Negative liberties, like traditional liberalism, isn't the only game in town any more, even in liberal circles. The idea that freedom is necessarily freedom from is not supported by some major liberal theorists (look at Rawls, or perhaps Habermas). The distinction itself, Eric Nelson argues, may not even be relevant any more.
Perhaps you didn't mean to say that this is what liberty is, but rather you were only stating your own conception of liberty, so my apologies if so - but to say that the only other possible conception of liberty is fundamentally wrong, or worse, that it is "totalitarian" is pretty shabby (as far as political philosophy goes).
>Well, I mean, then maybe we should outlaw animals having sex with each other? It's not like they give consent to each other.
This misses the point which is that most philosophers don't consider animals to be moral agents. Liberal philosophers themselves are divided on the "rights" of animals, however some prominent theorists argue that the property relations of animals should be viewed as custodial/trustee ones[0].
Even on free speech contemporary liberal philosophers are divided, but vanishingly few argue for no restrictions at all on speech, even considering obvious caveats (like threats of immediate violence). The trouble is finding a justification within a given free speech principle for certain restrictions to be permitted. It is a question of why we value free speech at all. For example, one justification for the primacy of freedom of speech is that freedom of speech aids discerning truth from falsehood, however how would this apply to deliberate lies? Surely most upholders of free speech would allow at least some lies to be uttered. So then comes the next free speech justification: that speech is inseparable from thought, but that also has its critics etc. (see Susan Brison on this point)
What I'm trying to say is this: maybe critics of liberalism have a point, and maybe we ought to rationally investigate why we hold certain liberal ideals rather than, in J.S. Mill's words, cling to them as dead dogma. It doesn't take an anti-porn conservative or a pro-universal healthcare progressive to do that.
[0] https://www.oxfordscholarship.com/view/10.1093/acprof:oso/97...