So fencing is a contact sport (hitting each other with metal swords) and has some instances of actual physical contact that actual physical strength matters a lot.
Deliberate hard hitting isn't allowed (plus tactically ineffective) but collision due to errors is an issue.
As for male clubmates changing tactics against me/less experienced fencers/younger fencers it's pretty standard as there's no point repeating an easy "win" point when you can work on something else that you're not ready to execute against a faster/taller opponent, because the "easy" option (that you can do already) would not necessarily be available against a person of equal height/power.
Like I said, small sport without the numbers for training just with your own category, we've worked out a way to make training (and non ranking competitions) work which would be fully trans inclusive...