meta: I neutralised the downvote here but in future you can probably find a way to be more delicate than the use of the word "loser". I understand the sentiment; but maybe there are better words.

Socially inept (genuinely socially inept)

Also there is probably a specific branch of loser that you are avoiding more than others; I for one can tolerate some loser-ish behaviours for limited periods of time. i.e. addictive personalities, a trait I avoid surrounding myself with; but can live with if thats an orthogonal trait to a group I am visiting.