Someone said he was not a fan of self-patronage. I was wondering, what does that mean? I have looked up the meaning of patronage.
There are two possible meanings of patronise which could be relevant here...
Obviously for purely semantic reasons, it's a little unusual to use either sense reflexively in respect of one's own self. But to the extent they are used, there are two equally valid derivative forms...
As can be seen by glancing through the citations for each of the above, #a is normally used with sense #1, and #b with sense #2. But we're at the margins of established/accepted usage here, and it would be pedantic to say using them the other way around was "incorrect". All you can really say is these are the most common ways the two senses are distinguished...
Without further context, I therefore suggest #2 embodies the meaning in OP's usage.
Self-patronising = patronising one-self:
Sometimes, giving praise to oneself, where the praise becomes a circular joke and consequently actually degrades oneself - therefore normally spoken in deliberate self-deprecation: