Happily, they didn't. They were all really welcoming, and I'm very much glad I went.
There was a fair chunk of the time that I'm fairly sure they all thought I was actually lesbian, until we had a conversation about who was out/who wasn't in regards to parents (and discussed coming out stories, for those that had them). I was eventually asked my out status, and when I disclosed I wasn't out to my parents I was asked if I was subtly directing them towards it with TV choice. At this point, I really felt I had to say I was ace, and thus had no TV choices. And they sympathised with me. They sympathised, something I wasn't expecting (most people don't even think about the fact there's little to no representation of aces in popular culture).
Before the meeting, however, I was doing some uni work in one of the computer labs. A couple of the other people in my course, M and B, were there doing their assignments too. We got talking as we did our assignments, and it eventually came up that I was going to the queer meeting at 5:30. I came out to them, too (so much coming out today! o.o) and they took it so very well. B was the one who actually asked what Asexual meant, and he and M both listened as I explained, asked a couple of questions, and accepted me. They didn't try to tell me I was wrong, or 'too young to decide' (both are a couple of years older than me), or caution me not to label myself. They just accepted who I was, and wished me luck with my meeting.
And I'm so very thankful to both of them for that.