We didn't watch the same interview obviously
because Dimitrov basically said he doesn't know what was the problem and that IF he did something wrong he would say sorry to Mardy in the locker room. And here is another citation:
"Явно съм го обидил с нещо, но нямам никаква представа с какво. Нещата, които той каза, не бяха много красиви, но явно е играч от Топ 10 и по време на срещата никой не му направи забележка"
(translation)"Apparently I insulted him somehow but I have no idea how. The things he said to me weren't very beautiful but with him being top10 player and during the match no one made him a remark."