Right DY, it’s about what crosses the line.
The whole idea of calling yourself a foodie does sound like that. This word is a recent word, and is also created with yeridos hadoros.
But as always, every person must ask themselves if they are seeking pleasure, or if this is a hobby they like/are good at. We cannot judge others.
But, IMHO, terming yourself a foodie sounds like you are in the first camp by definition. It says “seek out new expiriences”. So, objectively I think one should not call them a foodie. If I ever meet a foodie of course I will be dan lifak zechut that I do not known their intentions.