Not sure if you are aware, but Exodus International renounced conversion therapy in 2012, and Chickfila had already stopped donating to them at least a year prior. If you check your calendar, you will notice that the current year is 2019. I haven't found anything to indicate what Chickfila was intending with those donations, what the amount of the donations was, or what Exodus' pracitces even were, but presumably Chickfila did not approve of it any more than you do, since they stopped donating to them in 2010 or before, well before the public controversy.

This is about as thin of a reason for boycotting them as I have ever heard, and I've heard some thin ones.