I think real drinkers get uncomfortable with a quitter because on some level they know they are hurting themselves/behaving foolishly/being dominated by an addiction and your presence kind of makes them have to confront all that. Whereas if you at a party or bar with all drinkers then there is no cognitive dissonance thing caused by the contrast. But I can tell you that you will find out pretty soon who were your real friends that are glad for you and who were your drinking buddies who could care less about your health and can't conceal their own psychological issues with your sobriety.