As a newer first year player ...i have to agree that a lesser rated player doesn't get the same play from me, I feel what ever happens I'll figure a way out of it... of course this has cost me a few games....but I still fall into the trap of not giving the game against a lower rated player my same attention...as I would an equally or higher rated players. I'm careful of the new player now also...or skeptical of the player who never loses.
It does seem that your better players won't give up a pawn to the weakest of players just on their pure priciples of play. Crushing a weak player isn't really fun. I guess you hope they'll resign before that happens.
In this game, which I would like to call the most exhausting game I've ever played, I played a player a lot weaker than me. I played moves in my opening which I wouldn't even consider playing against a stronger player, just to get to a certain position. I ended up winning, but I felt uncomfortable throughout. All this begs me to ask the question, does your oppenent's ratings influence shape the way you play against them?