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I think you mean that you think CELTA tutors have a bias against (not towards) experienced teachers.
In some cases, to be honest, this can be correct. In many cases, teachers who have been working in different contexts than language learning and teaching are very strongly wedded to approaches and methods that research shows aren't effective in language teaching and learning. This can often mean that they are very resistant to learning and applying new ideas.
People who have taught EFL without prior training usually (naturally) work from the assumption that language teaching and learning is done in the same ways that other subjects are learned and taught as well, and can also be highly resistant to what course tutors are trying to convey.
Teaching language is quite different to teaching other subjects, and there is a large body of research to back this up. That's why it can be more difficult for experienced teachers who need to break away to some degree from what has been tried-and-true for them in the past. This can honestly be very difficult to do. It's also challenging for the course instructors to convey the need to change strongly enough.