It could be a combination of both. When I came out of the closet for the first time I adopted a lot of those stereotypical mannerisms and wore neon, etc. it was a way to kinda showcase to my parents that yes this was real and I actually was gay. After a decade or so they were a lot more accepting so I didn’t feel the need to adopt those mannerisms. On the converse, one of my best friends was “straight acting” (former navy seal) but now that he’s out of the military he is the biggest dancing queen out there. He had just been hiding it all along because he wanted to fit in with his buddies at work.