Very few Thai candidates - if any - have the courage to stop an interviewer rambling on about this and that.
This is not only because interviews can be somewhat intimidating, but also because krengjai and hai kiat will restrain most Thai candidates from interrupting the authority on the other side of the table.
Companies and managers also do other stupid things before and during interviews. Probably the worst is asking a candidate to fill in an application form prior to the interview. It is one of those habits regularly explained away by saying "we have always done that", or "all companies do this". Where is the logic in asking a person to spend 15 or 20 minutes filling in personal details and career background when it is not even known if the candidate is qualified and will pass the interview? The person's resume probably has all those details anyway. Many application forms look like the forms new employees are asked to fill in on their first day of employment. That is the only occasion on which these forms should be used.
If you are meeting so-called passive candidates, they may have been provided by headhunters. These people have good jobs and are not yet necessarily convinced that they shoud make a move.