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ima go against the grain here and say call. This bet is usually a weak hand such as AJ or 77 with 2-3 outs against you, so im not overly worried about giving a free card.

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It is not a free card. If the opponent is way behind, which I really expect him to be, then he by betting out in a semi-bluff, he has made a huge layoff to see that turn card.

By raising, I am encouraging him to check if the turn is blank, which would be correct, rather than betting out again, which is a really bad mistake if way behind.

In other words, the flop raise encourages the opponent to make the correct move whether ahead or behind.