Real DJs treat every gig likes its their last gig. Whether your audience is 2 people or 2k, big venue or small venue, headliner or opener. You are responsible for your image. People talk. Treat everyone with the same respect you expect to receive, even if someone doesn't seem respectful to you. Thats the reality of the industry. People gravitate more to partners that are easy to work with. Not someone that makes their life harder.