If you are shooting at normal hunting distances (400yds and closer) don't worry about it. You can take the tip right off of a plastic tipped bullet and not notice a difference. If you are talking long range then may want to look at something.
for that distance if it is breaking off tips or bending them 90 degrees worry about it. if it is just flattening them a little still not a big deal. Maybe post a pic to show the damage for reference.