Wait, your assets are the radar-evading types
but American...
2.1. Iran is nowhere close to US in the matters of stealth-related sciences even with access to an RQ-170 variant in its hands, mind you. Even Russia, with its technological prowess and access to remains of both F-117A in Serbia and RQ-170 in Iran, still failed to develop anything on par with American VLO aircraft.
That was an advanced Iranian RQ-170 copy, Israeli officials found it to be impressive upon recovering its wreckage.
True VLO class aircraft are exceedingly difficult and expensive to develop, mind you.
2.2. Americans have developed and fielded
the most powerful radar systems in the world -
3 decades ahead of anything in Russian and Chinese hands at present, and by extension Iranian. To give you a rough idea, Russia is sitting at 1st generation AESA technology whereas US is sitting at 4th generation AESA technology at present.
AN/SPY-1D(v) sensor system on-board the Arleigh Burke class destroyer can identify and track a target having an RCS of 0.0025 m^2 at ranges in excess of 165 KM on 3.3 GHz frequency (George Lewis and Theodore Postol). And in case you didn't knew, SPY-1D(v) have managed to notice and track ballistic missiles having an RCS of 0.03 m^2 at distances in excess of 1000 KM (heritage.org).
Green highlights = integrated set-of-sensor systems under the Aegis Combat System for collective target search and acquisition capabilities (sensor netting).
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Regarding your assertion of Houthi-operated assets humiliating all American made 'junks' in KSA and UAE:-
Please tell me what the Houthi-operated assets have accomplished in KSA and UAE besides publicity stunts/propaganda coups? Did they cripple defensive arrangements of KSA and UAE?
CAPTION: As of April 4, 2019, there have been
133 publicly reported intercepts of missiles fired from Yemen.
Latest development:-
Caught in the act.
Saudi defensive arrangements are taking care of Houthi-operated UAV as well, wherever possible.
For example:
https://www.thenational.ae/world/me...wn-drone-aimed-at-kingdom-from-yemen-1.834654
Recent development:
https://english.alarabiya.net/en/Ne...epts-two-Houthi-drones-over-Saudi-Arabia.html
Please keep in mind that the defensive arrangements of both KSA and UAE are advanced as per the standards of the Middle East but not at par with USN and USAF, not even close.
Both KSA and UAE mainly operate MIM-104 Patriot batteries armed with 2nd generation interceptors (PAC-2 class) at present, but KSA have acquired and stationed a MIM-104 Patriot battery armed with 3rd generation interceptors (PAC-3 class) in Mecca which have 100% intercept record against Burkan class ballistic missiles near its location.
MIM-104 Patriot (any configuration) is actually a
point-defense system, suitable for
protecting high-value targets; long-range against aircraft and drones but not against ballistic missiles. Nevertheless, PAC-2 and PAC-3 class interceptors have defeated MRBM class targets as well when they flew overhead at short distances, and this is very very impressive as per the standards of point-defense system worldwide. Please show me Russian-origin S-300 variants in Iranian hands having comparable performance levels, go ahead.
Easy for you to make fun of the defensive arrangements of other countries when your own are largely unproven and mostly hype - reason is that Iranian defenses are not thoroughly tested to this day.
There are gaps in the defensive arrangements of KSA in particular due to its huge geography, and small UAV can slip through unnoticed at times, but this is true for Iran as well.