I've only had one not-pleasant experience with the TSA people, (in recent years I'd done more flying around the country than previously in my whole life. But we'd usually fly at off-peak hours out of concern for my health (It just goes a lot easier if we go when I'm not as prone to get badly fatigued, ) and on that particular leg, it was both crazy-busy there at the checkpoint and I *was* pretty tired, so I don't blame the young lady for being snippy. Had the impression she was new to the job and a bit overwhelmed.
In general, if you're all ready for the inspection and thus make it easy on them, they don't seem too picky about the ISO of films that may be in your baggie. (I use a clear makeup purse and generally only carry a few rolls: one place, one of the fellows there actually had an interest in trying some Neopan when he saw mine. Can't beat a fellow film shooter at the booth.
)
But if you make it easy and are friendly, you might reduce the amount of exposure on your trip. The only possible problem I ever detected was from this roll of rather seriously-expired T-max 100 I think actually got exposed to X-rays pretty repeatedly over that time, forgotten in the bag itself. But that's why I wasn't more careful with it, I suppose, it might have been skunked anyway.