People use SL for all different reasons, and if people want to date and try their luck at meeting a partner on Second Life, then why not? The real world is full of misery, let's at least try and make the second one happy!
What you really stated was an opinion, not a fact! We all have them and if yours is different to the OP's then that's totally fine, but maybe you could have constructed it in a way which was helpful and contributed to the original post? Anyway I am not trying to argue, just giving a little insight as to why you may have been called rude.