Take an upscale martini bar from houston. Remove half of the rich pretentious snobs, all of the gold-digging call-girls, throw in some intelligent doctors, some local business owners, a biker or two, and a few aspiring artists and you get 21. Do not come here if you don't have social skills. These people will see right through all the snobby BS and, after you leave, the regulars will use your ego as a dart board.
My favorite thing about 21: People remember your face. Come a few times and everyone from the bartenders to the owners to the regulars will start getting to know you. And they're friendly people, if your attitude is right. They'll remember your name, your favorite drinks, and what you do or don't like about your job. A little smoky at times, but that's a bar for you. One thing I love about Galveston is that you don't need to wear your paycheck on your sleeve. Anyone will talk to you, and all you have to do is talk back.
Also, good music is key to any bar. Not top 20's, Hip-Hop, or R&B but live entertainment. Thurs - Sat night will not leave you disappointed. Wed night is wine tasting, where you'll enjoy good wine and some of the more consistent regulars, who are a blast. As far as the bouncer is concerned...I've been going there for 2 1/2 years and haven't had a single issue, so maybe someone said the wrong thing.
If you want a bar with arrogant snobs, ditzy fake girls, and a rude staff who want your resume and tax bracket before serving you a drink, I can think of several places up in Houston. For an awesome night with real class, 21 will never leave you disappointed.