Vegetables can absolutely increase inflammation, if I eat 6 cherry tomatoes, I get a visible inflammatory response. Tomatoes, vegetables have naturally occurring defense chemicals since they don't have teeth or claws to defend themselves from being eaten.
Animals know which plants to eat and which to stay away from, humans have lost this pure instinct, toddlers spit out the broccoli because they're in their pure natural state, but when the parent forces them to eat something their taste buds, brain is telling them to spit out due to the bad taste, sadly we don't listen to what our bodies are telling us.
We are the architect of our own destruction.