I had a worn out presta air chuck on my floor pump that did start pulling presta valves out of the tubes. I replaced the chuck and hose for about $4.50 USD and it's still working well 7 years later.
However with Schrader valve tires, another issue might be that you don't put enough air in them and the valves don't stand perpendicular to the rim. So the stem is put under some stress where the angled stem intersects with the hole in the rim. Make certain your valve stems stand upright.