Ending sentences with prepositions is perfectly normal fine use of english. What irks me is when people try to sound fancy by using the preposition in the middle form but then also have a redundant ending preposition.

Example:

“With” is a perfectly fine preposition to end a sentence with. ✅

“With” is a perfectly fine preposition with which to end a sentence. ✅

“With” is a perfectly fine preposition with which to end a sentence with. ❌