You will find that diabetics often do have low blood sugar, but that's because they overestimate how much insulin they need to inect, causing their blood sugar to go too low. The hypoglycemia in this scenario is not caused by diabetes, but rather a dangerous side effect of the treatment.
OP doesn't have diabetes, and (unless he's abusing insulin for body building purposes) isn't taking insulin. His postprandial hypoglycemia is likely a benign case of "reactive hypoglycemia" (https://www.mayoclinic.org/diseases-conditions/diabetes/expe...).
My understanding was hypoglycemia only occurs in diabetes in the presence of medications used to lower blood glucose (insulin formulations, sulfonylureas, etc.) and not because of diabetes itself, which when untreated invariably leads to hyperglycemia.