[mr.spam]

Calling all-in's with flushdraws is usually bad. The case you provided is totally bad. You may have AdKd yourself and villain can be drawing fairly thin. If he had like Ad2d, he could make a better move since he has a pair + NUTflushdraw + an overcard as well. So to call an all-in with a flushdraw, you need more then your naked draw. One or two overcards, a gutshot/openender or a pair, and preferably, the nutflushdraw. Of course, no-one's folding 8d9d on a 7d6d2c board...