Stick and tin trailers are referred to as entry level because that is the type of trailer many people start with.
There is no need to take the reference personally.
My prior RV was stick and tin and it was a great rig. I have many fond memories of that TT.
In my case it was an entry level trailer because like many before me I entered the RV world with that stick and tin trailer. Honestly I understand the reference to entry and I do not consider it an insult or attack.
If I suffer any severe delamination issues with my current fiberglass and aluminum constructed trailer, I could easily see my next rig being stick and tin often referred to as entry level.