What is it called when someone attacks a person and the offender gets an even worse reputation?

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Chapters
00:00 What Is It Called When Someone Attacks A Person And The Offender Gets An Even Worse Reputation?
00:24 Answer 1 Score 38
00:36 Accepted Answer Score 33
00:52 Answer 3 Score 43
01:16 Answer 4 Score 8
01:23 Thank you

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Full question
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#singlewordrequests #idiomrequests

#avk47

ANSWER 1

Score 43

You could consider using the verb backfire which means:

(Of a plan or action) have an opposite and undesirable effect to what was intended: 'overzealous publicity backfired on her'.

Your example (You need to change the word order):

George's attack on John backfired on himself.

[Oxford Online Dictionary]

ANSWER 2

Score 38

George undermined himself by attacking John.

ie, 'mining' under what respect you have, causing your own self to 'fall'.

ACCEPTED ANSWER

Score 33

George shot himself in the foot by attacking John.

To do or say something that inadvertently undermines one's interests.

_TFD

ANSWER 4

Score 8

George scored an own-goal by attacking John.?