If you don't want to force water into places where there shouldn't be water, then ya shouldn't clean your bike with a pressure washer... but I can't see what caused the bike to fall in the direction of side stand like that. I think either the stand wasn't pushed all the way out or the stand was faulty. If it was strong enough to push the bike over towards the stand then it should have been more than strong enough to have already pushed the bike over away from the stand when he was cleaning the left side of the bike.
