What is the word for talking to someone as if they don't know anything

This is noticeable in conversation when person A keeps trying to educate the person B. Person A automatically assumes a position of higher knowledge. What is person A doing to person B? It's not patronizing is it, because he isn't necessarily trying to talk to the other person in a condescending manner.

Solution 1:

There are several words depending on the context. When you say,

person A keeps trying to educate person B

It can mean that Person A genuinely had more factual information and it was actually a dialogue between Person A and B, then Person A could be educative or informative.

If on the other hand it was one-way traffic and Person A was speaking far more than Person B, then Person A was trying to edify Person B and Person A would be a pedagogue or a pedant; the latter if Person A was being persnickety.

If Person A was condescending to Person B, only in that case would Person A be patronizing Person B.

Solution 2:

Person A could be trying to mentor person B in a particular subject

• perhaps A is seeking to evangelize a particular technology or religion
• or A has a pedagogical nature
• A enjoys being in an advisory capacity to others, maybe going so far as dispensing unsolicited advice