Can you explain in more detail what you mean by "every time it rains my traction control comes on"? Are you talking about some electrical issue where rain makes the TC light come on? Or are you talking about limited traction in the rain which causes TC to cut in? I have a Touring 2.0T (different tires, different engine, different transmission) and I will say my car is very traction limited even in best case scenarios. I don't know how easy it is to spin the wheels on the Sport 1.5T, but it could just be getting used to the throttle. I have no issues with my car in the rain. Now my Touring tires in the snow is a different story...
1) you mention your previous car being smaller and not having any issues. The Accord Sport has 235 width tires. A wider tire will inherently have more problems with hydroplaning than a narrower tire (more surface area to have to push the water away). It could be that you are just getting used to driving a different car.
2) I believe (correct me if i'm wrong) that the Sport comes with Goodyear Eagle Touring tires. While they don't have the ultimate wet weather traction, they aren't known to be terrible in the rain. Check out Tire Rack's rating system, users rate it at 7.8 "good"( https://www.tirerack.com/tires/tire...=2018&autoModel=Accord+1.5T&autoModClar=Sport
3) Also looking at the Tire Rack user reviews (and I believe I've seen some other posts on this forum as well) the Goodyears may
wear more quickly. That same link says it's tread wear is "fair" at 6.1 and a couple of posts mention needing to replace the tires sooner than expected. So check your tread wear and see if the tires need replacing. Maybe look up the tire manufacture and see what they warranty the car to (milage wise). But it's sounding like you just need new tires. 26,000 miles is not "brand new" and could legitimately need replacing.
4) don't hate the car for tire issues.