As others have said already, some people argue without reason, and so you can never win an argument against them; it has no bearing on whether or not you’re right, so it should have no effect on your opinion.
There’s also situations where you’re arguing from a perspective you aren’t fully confident in. If you can’t win, it’s not that you should change your mind, it’s that you should investigate the topic more deeply. It could be that that leads you to changing your mind; it could be that it reinforces your views; but not being able to win the argument, in that case, is only a sign that you should go learn more about the subject, I’d say.
No.
As others have said already, some people argue without reason, and so you can never win an argument against them; it has no bearing on whether or not you’re right, so it should have no effect on your opinion.
There’s also situations where you’re arguing from a perspective you aren’t fully confident in. If you can’t win, it’s not that you should change your mind, it’s that you should investigate the topic more deeply. It could be that that leads you to changing your mind; it could be that it reinforces your views; but not being able to win the argument, in that case, is only a sign that you should go learn more about the subject, I’d say.