Dylan's (sexual) imprint on his mother dates back to his childhood. See the conversations in the bathtub scenes....
And then again in a latter episode THE SWIM LESSONS, Sofia got pulled in the water and T-SHIRT was transparent....as she went to the house SAM was talking again about what a MILF -- DYLANS MOM was.
To me those two episodes opened DYLANS EYES . By his comments Dylan became obsessed with SOPHIA.
L& P needs to reassert the OLD Sam. HE used to be my favorite dude.
The fact that Dylan only becomes fixated on his mother through Sam's comments is actually impossible.
For me, this aggressive denial of seeing his mother as a sexual being when Sam points it out to him was just an avoidance strategy to deal with his feelings.
If that was L&P's intention at all.