Pretty much every social & cultural group and subgroup has some degree of conformity. Even when they think in their own minds they're not conforming.
I remember the counter-culture movement of the 1960s. The youth was rebelling against the ways of the preceding generations. They were going to be unlike their parents & grandparents, living suburban cookie-cutter lives.
But, I noticed, the young themselves had adopted equal conformity. For instance, the hippie "uniform" was every bit as predictable as a business suit. Different, but not really original from individual to individual, following the same style conventions within the hippie group. And just as certain professions had their own vocabulary, the hippies practically had their own language. And you had all better speak it, if you wanted acceptance, or at times, even comprehension.
I can see some of that in the gay community. Different from straights in some things, but much more the same among each other. And especially along generational lines. I find younger men to be more conformist on average, a bit opposite of what you might anticipate, whereas older men are a bit less rigid (not a double entendre). There are other generational differences between them, but within their respective age groups the level of individual conformity is higher, on a gradient scale from youngest to oldest.
Which I conclude is more a function of basic human nature. That I've seen all my life, in many circumstances, not just hippies and gays. So that I don't believe conformity is peculiar to gays, nor is it being consciously enforced, perhaps as part of our imaginary agenda. It's just the way people naturally associate and behave.
Although I also recognize that there is another group, separate from all the others: the militant evangelicals. These are people who feel driven to impose their beliefs & agenda, political & religious, on others. Mostly Christian conservative straights in the US, a few inexplicably are gay. A self-destructive behavior that many behaviorists ascribe to guilt & self-hate. But I consider them to be abnormals in the gay population, and should not be incorporated into models of typical gay behavior.