There are two easy solutions to this...

1.) Turn off shout chat. It's not like anything of value would be lost since 95% off what goes there in the big cities isn't just ads for venues, ads for RMT, or general crap-posting. I've played the game since like 4.1 and I can count on one hand the number of times that I've seen anything worthwhile in shout chat.

2.) Don't go into the "Other" section of party finder.

Like, don't get me wrong. As a role-player, I hate a lot of these venue ads since I hate most club venues with the weird mix of IC/OOC... But if I feel that it's the internet.