I agree with @lalitk @jjss49 , In general you will get buyers that want to see how far they can push limits on an offer. I just did this buying a car for one of my children and got most of what I asked for, I also would have respected them declining the offer and countering. When I get a low ball offer I respectfully decline and make a counter offer. Why get mad on either side?
Why do so many sellers take offense to offers on their listings?
If you have the 'offer' feature activated then what's the problem with any offer. Comments like 'lowball' offers will be ignored just gives me a bad vibe. If your item has been up for sale then there is no insulting offer. I've made deals with people starting far apart and coming together. If you haven't noticed the audio market seems to have come to a standstill. Any opinions?