I try to come correct, to be pleasant to the TSOs, to greet them cheerfully, and cooperate as best I can with the screening process (and when opting out, doing so politely.) I don't believe in harassing TSOs, as it's the system I despise and I see little gain in being rude to individuals.

However:
--that doesn't mean that one HAS to do these things. TSOs and people in positions of power should realize that pax shouldn't have to be having a great day in order to get through the checkpoint. Likewise, making "jokes", particularly about security threats or barring one's ability to travel, is an implicit threat given the power imbalance between pax and TSOs and the utter lack of recourse afforded to pax;
--I am a white cis male, a native English speaker with an American accent, and I don't look threatening in any stereotypical way (tattoos, dress, etc.) I realize that this affords me privilege in how I am treated. Because I certainly witness hostile behavior by TSOs directed at people who don't enjoy those essentially random characteristics that I do, and bad behavior not directed at me is still bad behavior. It's unprofessional and is emblematic of an attitude that I believe ultimately leads to less secure air travel;
--I also witness hostile behavior, power-tripping, yelling, and other bad behavior by TSOs that doesn't seem to be directed at anyone in general, whether or not the passengers in question are nice to TSOs. Whether it's TSOs barking in loud angry English to pax who don't speak the language at JFK T4, or the snarled "What's your destination?" at MSY, or not letting people maintain visual contact with their carryon luggage while clearing the MMW at RDU, it's still unprofessional choices from TSOs that don't comport with the TSA's mission statement;

And, I've noticed a marked improvement in TSO behavior over the last 2-3 years or so. I'm not a terribly representative sample, as I fly less than some (and a whole lot less than most FTers), but I see much less barking or other hostile behavior from TSOs than I used to. But! It still happens, and I see it maybe 15-20% of the time, as opposed to 80% of the time, and that's still unacceptable.