Fishing lake with no public access

I took my brother and two nephews fishing at Lake Coffee by Moose Lake MN two weeks ago and was told very rudely that it is a privet Lake.  We didn't access the lake through anyone's property.  We parked on the side of the road where we were told we could park and started to fish.  An hour later we were approached by a very angry man threatening us.  Being the kind gentle man I am ( FALSE) Hahahaha I started being rude back.  My point is, are there any privet lakes in MN we aren't able to fish?

If you can legally get to the water you can fish it.  If a water body is completely surrounded by private property then it is in effect private unless you have permission from a landowner or a helicopter to drop you off in the lake and you never set foot on the shore.  A good resource for finding out who owns what is the parcel viewer on the GIS website of whatever county the water body is in.  Not all counties have interactive maps but most do.  I took a look at the lake you mentioned and it looks like you would be ok if you fished the spot right where the lake bumps up against Hwy 61 as that's within the right of way of the highway.

Most wardens take this crud very seriously. Top priority from what I've seen. Call them.