Spent 20 minutes hunting a missing bracket because I refused to use an IDE

I told the interviewer I'd rather use notepad than an IDE because I wanted to "prove I could code without help." Twenty minutes into a linked list question I'd typoed a bracket three times and had no idea where, because there was no red squiggle, no autocomplete, nothing. The interviewer just watched me scroll up and down hunting for it. I finally found it, finished the problem, and still got a no. Looking back I think I was trying to perform confidence instead of just solving the problem well. Now I use whatever editor they give me and save the flexing for actual work.