I get what you are asking and I am going to avoid the specific topic you were discussing (as much as I can) in the interest of objectivity.
ml tends to be a safe-space for some people who have wildly different opinions than what “many people” tend to believe is true. It automatically sets up a comment that would be “normal” on this instance as “hostile” on another.
Some countries do have diplomatic ties with Hamas and do not consider them a terrorist organization. If I had to guess, that is the reason for the underlying issue. If a person happens to relate with that viewpoint, any comment to the contrary may be considered hostile.
This sounds trite, but the phrase “Read the room” might apply.