On one hand...vanity plates are stupid. Why would I want to make it easy for someone to remember my license plate number? I want my car to be as forgettable as possible - neutral color, no vanity plates, no bumper stickers, nothing hanging anyplace inside. I drive a silver Camry - good luck finding me.
On the other hand, Texas is ridiculous. I can't even imagine how someone would find some of these offensive. And no references to gender, ethnicity, etc. even if it's not offensive or derogatory? I wouldn't expect that restriction in Texas.