My guess is that, since you are going in the evening, he only has very limited spots and has committed evening appointment time to too many clients. I doubt it is about you being unlikeable; probably more about poor time/client management on the therapist's part. Talk to him about scheduling out a several weeks/even a month in advance to reserve weekly appointment times. (It might take a few weeks to get that set up as he'll initially have to work around who he already has scheduled, but he should be able to do it given a few weeks.) If he is unable or unwilling to accommodate that, then you might need to find a different therapist.