If its not someone you just played with and isn't on your friends list, I feel like most people don't really interact with the message. CSGO has had so many skin scammers through chats that it's basically expected that you're being hit up by someone trying to get into your account for skins or trade scam you.

This is much worse than those situations, but luckily (and unluckily) I think the CSGO culture is fairly prepared to avoid random invites to parties.