Assertiveness training techniqes (and thats "assertive" NOT "agressive") say to be honest and open about feelings.
You might say "When you/say do (such and such)..., I feel put down"
Then explain what change in behaviour you would like, ie "please stop making these sort of comments as I find them annoying and I want us to both work as an effective team"
The last part may or may not be spoken depending on whether you have had words before!
ie "If you persist in making these comments then I will have to consider what action is appropriate etc".
Remember we want a Win/Win situation on the flight deck and people who make these type of comments are often insecure about their own position and trying to compensate for it.