[drblast]

  I was talking to a group of friends about this and he thought it was weird too.

Is that confusing? That's about how it sounds to me when anyone uses a plural pronoun in place of a singular one. I know it's common usage but it's not a particularly good solution.

[sixbrx]

Well "he" is never plural but "they" is sometimes singular (like the logical "some").

Does the sentence: "I was talking to someone about this and they thought so and so." really sound weird to you? It doesn't to me. Also I wouldn't call it a "solution" because it wasn't just invented to solve this problem, it's just already common usage.

[recursive]

Surely it's no worse than this:

I was talking to a group of friends about this and thon thought it was weird too.