I don't think I do. Normally I won't be the one to start a conversation, but if someone spoke to me, regardless of their attractiveness, I'd speak back. If it was me making the conversation, they would have to be incredibly unattractive for me to not bother. I suppose we all have different opinions as to what incredibly unattractive means though. :P Although, as said previously, in terms of hygiene then it's a different matter for me. Honestly, If someone lacks basic hygiene then I'd avoid speaking to them.