I think there's some possibility for confusion of terms because lead and rhythm means different things depending on what precise area you're talking about.

In a rock band, there's usually a division between the rhythm guitar whose job is primarily harmony and chords (the left hand of the piano) and the lead guitar whose job is to play little melodies and solos (the right hand of the piano). You don't need to learn rhythm first. Rhythm isn't any less musical than lead playing. And playing lead well requires lots of rhythmic ability.

Definitely work on your rhythm-playing even if you don't intend to be a rhythm player. Many lead-guitar effects like syncopation and suspension require a keen rhythmic sense to accomplish. Sometimes a lead can be as simple as copying the rhythm part, replacing full-chords with power-chords, or replacing power-chords with dyads or just the root notes. 



If you try to view the two guitarists as team whose job it is to play the song, then you can steer away from the view that the lead is more important and the rhythm should be delegated to the junior of the two. Rhythm and lead both have a function to serve and sometimes the rhythm is more important, sometime less important. Sometimes you gotta tell the soloist to chillax a few bars and let this groove breathe. The lead is the driver, but the rhythm is the horsepower. 

And lead playing can be very rhythmic. Listen to some Louis Armstrong trumpet solos where he's just wailing the hell out of one note. But all the bending and wiggling is in rhythm. 

Learning how to be a good rhythm guitarist before becoming a lead guitarist, where to start?
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