Most of the time, persons with a higher "Rate" rarely play players with a low rating for numerous reasons, biggest one being the fact that they lose more rating points if they are defeated by a lower rated player, but not everybody.
There is no need to worry or be put off by these sorts of players who spectate and comment on this, just ignore them and let them report you if they "suspect" that you are cheating, chances are, most of the time they won't report you as there is clearly not a case to report, or they will report it but I am very sure that the moderators are well aware of how to spot a match fixer from a mile away.
Regards.