わけじゃない

The structure (という) わけじゃない (or ではない) can be used to deny a statement, with meanings like "It doesn't mean that" or "it's not that..."

漢字が苦手だと言っても、全然書けないわけではない。
Even if you say you're bad with kanji, that doesn't mean that you'll never be able to write them.

試験の点がよければいい成績が取れるというわけではない。宿題やプロジェクトも大切だ。
Doing well on tests doesn't mean you'll be able to get a good grade. Homework and projects are important too.

この料理はまずいわけではないけど、油が多いから、あまり食べられない。
It's not that this cooking is bad, but since there's a lot of oil, I can't eat that much.

あの人が嫌いなわけではないんですが、デートしたいとは思いません。
It's not that I hate that person, but I don't think I want to go on a date with them.