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Well the doctor's attitude towards his past self changes with his personality. He seems to be fonder after a while though as the third and second constantly fought with each other in The Three Doctors. The Fifth Doctor was not a big fans of the others remarking how glad he was to no longer be them. 08:19, October 14, 2012 (UTC)Alex2014

The Sixth Doctor laughed at Peri in The Twin Dilemma after she told him he used to be sweet. He clearly didn't like his Fifth self. Then fast forward to the Tenth Doctor in Time Crash and he loved being the Fifth Doctor. It depends on the Doctor, some like their previous selves, some don't. 08:42, October 14, 2012 (UTC)

Some like some of their previous incarnations. Ten (in "The End of Time") sounded as if he didn't like Seven. As already pointed out, Ten did like Five. One was rather acerbic about Three & Two ("a dandy and a clown") but One was acerbic about almost everyone, including people he definitely liked, so that doesn't tell us much. In the cases of most incarnations, however, we just don't know what they thought of most of the others -- for some (especially, Four, Eight & Nine), we don't know what they thought of any of the others. -- 14:15, October 14, 2012 (UTC)