Earlier quoted context omitted.
With respect, that is easy to say when ~50% of the population is a potential partner and is easily determinable. When you are gay and the majority of guys are straight, finding partners organically is near impossible (unless you're in a gay bar or something). I'm not condoning Grindr's actions or that people shouldn't use it with care, but it really has become a key part of LGBT networking in the modern era.
I think it depends on where you are, the city I live in has a very large gay scene. So I've had guys just try to chat me up while I'm at a restaurant or something, I don't mind. The only time it was a bit weird is when a co-worker told me I look like his husband, not okay to say at work.
A female coworker told me that once, didn't seem that weird.