"Trump is a bad guy". Well OK but the ACLU does more than just fight Trump. It's possible that people have mixed feelings about those various things.
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Trump (and Clinton) had record-breaking unfavorable ratings during the campaign. Your point about "less-bad" carries a lot of weight, in my opinion (and would have been the case regardless of who won the election). And step back and think of it: half think bad, half think good. Is that a situation you'd like to consider "not bad" in the grand scheme of things? Mediocre sounds like a fairer assessment, on average. And frankly I think we'd all prefer a solid "good" rather than an ambiguous "not bad".
Doesn't make him not a bad guy.
I tend to stay out of politics, and don't really label people as such, but Trump is a bad guy. I'm happy to donate engineering time to the ACLU.