Whether it's a problem that your grandma, or anyone else, thinks you're gay for having a certain job, depends entirely to how much discrimination gay people get from society. I think that the less discrimination gay people get, the less likely people are to think you're gay for having a certain job. All of this is connected somehow.

He isn't talking about grandmas. At least in the UK the primary reason for the steep decline in male primary school teachers is the perception that men are much more likely to be targeted by false claims of child abuse, and will be treated much less fairly if so.

I remember reading a story about such a case some years ago. The male teacher in it had eventually proven his innocence and that the child was a malicious liar, but the process had wrecked his family and made him unemployed. He wasn't going back into teaching and stated to the press, very clearly, that no man should ever work with children because the female-dominated profession would always find a man guilty until proven innocent, regardless of the merits of any case. I remember it clearly because his view was so stark, so bleak and yet so well articulated and justified. I decided right there and then that I'd take his advice and stay well away from teaching.

Not that things change much as adults, of course. Every time there's a run of men proving their innocence in false rape cases (in the UK), feminists go nuts and insist the law is changed to prevent men using that tactic to prove their innocence in future. The "females must always win" mentality is pervasive and makes working in female dominated professions risky.