I could be mistakenly thought gay, though it depends on the nature of the company in question, some men being more wedded to masculinity as a mark of excellence than others. I'm sure I've met guys who would see my dress sense, sensitivity, compassion, vegetarianism, football-indifference or intelligence as a sign of gayness. But I've no idea how many are like that, I seem to unknowingly repel them and have never seen any examples of it in my circle of friends, only acquaintances, and mostly way back in the past when I was a schoolboy or student at the local technical college. I also worked all my life in universities where most folks were pretty well-educated. I haven't been mistaken as gay by anybody in the gay community yet, though I've only knowingly dealt with a few gay folks.
I sometimes get a whiff of it when reading stuff by men on the Web, when they display what to me is a puerile, sex-obsessed mentality about women, and it seems depressingly common. Even when I was a teenager I wasn't too heavily into that. So for example, when a college kid was wondering about the wisdom of having sex with his girlfriend, I asked him "do you love her?" and he was puzzled by that, and didn't answer, and I think it put him off me to a degree. I was a bit of a hippie in those days (I still like a lot of their philosophies), and I think that can be enough to give some men that kind of an illusion about me. I suspect I'm similarly prejudiced the other way round, i.e. I don't allow for the existence of gentle giants, even though I've met one or two.
Just to complicate things more, I often have a somewhat "tough" turn of phrase when I speak, and a facial expression to match, and I'm afraid I don't feel as much patience as I'd like to feel when I notice anybody, male or female, who doesn't fight back when they're attacked, though I usually think it through and don't end up harshly telling them to get a grip. I've wondered a lot about this, and I think it may be down to projection or an over-empathic thing, I just hate to see anybody letting a bully walk over them. I've never equated it with gayness though, one guy I rather like is both gay and of a tough persona, and I'm sure it's not uncommon.