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I agree. It's absolutely insane to side with Castro. Even if you agree with his political philosophy, there is overwhelming objective evidence of how awful it is: - Cuban economy - Cuban quality of life - basic Cuban freedoms (like supporting parties other than the one in power)
To be fair in the US there are also attacks for supporting political parties. Yes it's a different degree of extremism entirely.
For example the terrorist/riot/civil activist group (whatever you want to call them) By Any Means Necessary violently attacked white nationalist parties (they claim they're not white nationalists, but media says they are, I don't know anything about them beyond that) at rallies without legal consequence. No I'm not defending white nationalists, I'm defending right to assembly. What I'm saying is that if that's your argument for why Cuba is terrible then it's not consistent unless you are making the same argument about America as well. If you just happen to agree that they're a "bad party," so you it's OK here, not there, that's exactly what authoritarian government is.