I don't think that's gaslighting, because it's not malicious, and it's not disagreeing about objective facts. I may be wrong, but I think most people would agree with me on that.
I don't mean to minimize your experiences with your ex-husband, but I feel like you might be extra-sensitive to manipulative behaviors to the point where you sometimes misclassify normal behaviors as manipulative. (Which in a lot of situations is better than the reverse!)
There's not an easy answer to this-- for some people, getting accused of manipulation when they are acting normal could
itself feel manipulative
, so you can't really get free rein to make those accusations. But we don't want to completely deny you the ability to express it. Maybe a good compromise is to ask you to say how you feel more descriptively (e.g. rather than "you're gaslighting me!", say "I think my point of view makes sense and it's upsetting me that nobody else is seeing it").