Well, no. There are plenty of ways to interact with them. They might not be advertised, but they're there.
1) GUN-HO 'MERICA!!! SHOOT FIRST THINK LATER, OOH-RAH!!! *BANGBANGBANGBANG!!!!*
2) You can appease them by providing Thargoid tech and, if you're feeling a bit sinister, escape pods or slaves. Seriously, they act like purring kittens if you bring them gifts, and if you bring too many they call friends in to help pick them up. As far as the whole "collecting humans" thing goes, I'm still not entirely convinced they're being harmed anyway. Is someone going to try and argue humans wouldn't do the same if a Thargoid presented itself? It's all about research and learning.
3) You can try to collect black boxes, escape pods, and Thargoid tech from under their noses. They'll leave you alone entirely unless you tick them off, it's quite fun attempting to take this stuff whilst they're turned around. They only seem to get mad if they SEE you take them.
4) If you feel like a bully and REALLY want to get on their bad side, jettison an ancient relic to them and see what happens. They do NOT seem to like the Guardians one bit!
But be honest, what is the most interesting out of the boring lot of suggestions? Shooting them, I know you don't want to hear it but shooting them is the most interesting thing for the average person to do as the other ways at least at the moment do not provide anything meaningful to the player.
2.4 was hyped up like every other expansion and it has been a disappointment.