With the Clarets inside the bottom three of the Premier League, Parker was jeered by fans during last week's defeat to Fulham.
"I don't think it's justified and I have an understanding of it and that doesn't come from what I believe but I understand it because of the world we are in," Parker said ahead of this weekend's clash with Bournemouth.
"I don't agree with it. You don't become a bad coach in four months.
"You are working tirelessly and you are fully committed. It's what you sign up for. I am an emotional person and I wear my heart in my sleeve.
"To get the team to this position in the Premier League and see it change so quickly is hurtful. I will never be in doubt, you can chuck anything at me and I will keep bouncing back to try and improve this group."