It depends on the position of the person. In most labs, if the technician did the job, the technician may not be an author of the paper or poster, but the boss usually arrange the technician to some conferences (free tourism).
Talk to your boss calmly and professionally about the issue. Your boss might not even looked at the author list during his review. I know you must feel hurt in the situation, but names on a poster is really a "small deal" for both you and your boss. The more important thing is make sure s/he knows you care and you will be an author on the paper.