Should i be embarrassed for being gay? gay messages in restroom? craigslist gay?

i know gays are considered taboo but should i be embarrassed? and why do gays write in the restrooms for contact? For example i was a Marshalls the other day and had to pee, so i went to the restroom. I peed and washed my hands, turned around to dry em and i see this message on the paper towel dispenser " if you want your blah sucked call blah blah? and is it ok to be like a slut like just sleep with people? like on Craigslist? i see that alot.