One tip that you should definitely take into account is not to pay too much attention to such banal things, especially if your posts were deleted in a self-moderated topic or if someone reported them and the moderator deleted them - in both cases, you cannot do nothing but publicly grumbling about it, and that leads nowhere.
I am of the opinion that in some boards a certain amount of seriousness should be maintained if we are discussing serious matters, but even then I do not see anything wrong if someone writes something that is slightly off topic and I would never report such a post.