Research from anti-discrimination body Kick It Out showed the Blues were the Premier League club to receive the highest volume of discriminatory posts with 20,000, followed by Liverpool (19,000), Arsenal (12,000), Manchester United (11,000) and Manchester City (11,000).
Chelsea are seven points clear with seven games to play ahead of Saturday's match with Manchester United, who are eight points behind in third, having led from the opening round of fixtures.
"I think because we are boring," said Mourinho, when asked about the research on Friday.
"Top of the league since day one
It's something in this country people don't like.
"I think everybody would love the Premier League to be like the Championship at the moment, with four teams separated by a couple of points.
"I know this is the ideal scenario in the Premier League
But since day one we are there and we are trying not to allow that to happen.
"We have big determination to be champions."
Source : PA
Source: PA