First off, I assume your snake regurged on Sunday, then you tried feeding it the following Wednesday, then you tried again the next Wednesday. It's actually pretty normal for a snake to not eat for several weeks (usually 2-3 weeks) after regurgitating, but if he's still not interested in the rat after a month and you notice him starting to lose weight, feeding live should at least be considered.
To answer your question, he's likely still stressed from the regurge and just doesn't feel like eating. It's also possible that he isn't pleased with the rat like you suspected. Make sure you have thawed it properly and that there aren't any ice chunks or frozen parts on the rat. Also, warming it up to body temperature (aboyt 100°F) with a blowdryer or just on the heat source of your snake's enclosure will help a lot with his interest. Then again, you should take my advice with a pinch of salt as I've never fed f/t, I prefer live
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