Took me a long time to realize this...
I hate pushers because they highlight my deficiencies.
I have spent so much time, refining technique, technique, technique, and here comes a guy with **** poor technique, it made me think all my training was for naught. What I didn't realize (in the past), is that tennis is much more than pretty groundstrokes... While up to 4.0, technique is the main focus... but at the higher levels (eg. 4.0+) other factors come higher into play: movement, mental toughness, smart split second decisions, conditioning, consistency, agility, etc... So while I was good beating up on 3.5's with my "superior" technique (eg. topspin forehand and backhand, spinny serves, etc...) when I came across 4.0 pushers, they highlighted that while my technique was superior, everything else needed help.
Like:
* They were in better conditioning that me - often pushers I ran into were formerly/currently marathoners or ultramarathoners.
* The made better decisions than me... mainly because they only had one decision, high & deep into the court - while I was trying to aim my shots, hit corners, etc...
* the hit deeper than me... because that's all they focused on practicing... whereas my immature topspinny shots had a tendency to land short.
* as a baseliner, they highlighted a poor overhead and net game... so my first strategy i read on beating pushers was "come to net", but that only works if my approach shots, volleys and overheads, especially my overheads, were decent... how many folks practice overheads and approach shots daily? I didn't. At the time, my practice usually consisted of hitting baseline to baseline for an hour (not even cross court).
* highlighted my poor midcourt game... despite having technically correct strokes, they highlighted i could only hit them from the baseline... I couldn't finish consistently whenever they gave me a short midcourt ball
That said... I've learned to love playing them, because I realize they are the grinding stone that will make me sharper.