Yes, that is wrong, but as far as catching disease from those dirty glasses, you are problably no more likely to do so than by putting your hand on a public stairway handrail, the handle or knob of a door to a public building, and then put your finger in your nose or mouth. Germs are all around us. There is no escaping them. While there is no excuse for the hotels not to send their glasses to a dishwasher to get them properly cleaned, neither is this an excuse to be paranoid about using them, or refusing to stay in a hotel. If you are really paranoid, bring a little vial of dishwashing soap with you and turn on the hot water and wash the glasses yourself. However, don't touch the door handle when you enter the room if you are afraid of catching something.